There is something that a lot of people are forgetting in the little SLI discussion and that is the word "windfall".
In the context of the SLI and ALPA merger policy (something the arbitrator will have to use), there is a line that states something about no single pilot group can receive a "Windfall" or excessive benefit over another or other pilot groups. It could be argued that with the changes in work rules, pay, etc PLUS the added potential of placing a 3 year "Q" captain at the same seniority as a 9 to 12 year 900 captain would be a "windfall". Same could be said for a 2 year FO getting placed with 5 to 7 year FO's and Captains.
After hearing arguments from each group the arbitrator will go in a room and decide then bang - it's a seniority list. I'd prefer this to NOT go to arbitration because there could be some compromise, whereas arbitration could be a poo sandwich for a lot of us.
What I want is to be secure in my seat, my base, get off reserve some time before retirement, and the knowledge that I will get the 900 or "Q" some time in the reasonable future. That and not being JM'd on my days off or having sneaky extensions. Other than that I can be real flexible without the need to crush someone else.